Though Killian's main motivation is not the get revenge on Stark. His main motivation is to be Stark: he wants what Stark had because he feels inferior, including the women of his life (he takes Pepper as a trophy and kills Hansen once it's made clear she still prefers Stark over Killian).

He's perfectly willing to give him the desperation he felt, but note that every time he actively tries to kill Stark is because the later proved his superiority (after the thing on National TV or when Stark starts to cancel his plans at the end). He is, however, also open to have Stark as a subordinate to make his projects a reality so no, revenge is not the main motivation for Killian.